Orange UK will expand its Android roster when it begins selling the HTC Desire in April. Though T-Mobile UK will be first to offer the Desire when they carry it starting March 26, Orange may have an advantage by offering the phone for free on select monthly plans.

The Desire, which puts HTC’s Sense interface into a 2.1 device similar to the Nexus One, will be available this spring. Orange retail shops and Orange.co.uk/shop will begin selling the device in April. Orange has yet to announce how much it will cost or which monthly plans will be eligible for the complete subsidy on the Desire.

HTC debuted the Desire earlier this morning, touting the 3.7-inch WVGA touchscreen that supports 32 GB microSD cards, 512 MB of memory, 5 megapixel camera, and an updated version of the Sense interface. Orange plans to add onto that feature set by including their own Orange Maps, Orange TV, Photography, Games, and Orange Windows Live services.